a little salt goes a long way with this kind of plum. just put little salt and eat it as is.

another option can be taking out the seeds and choping them into a bowl of yoghurt, yoghurt will somehwat neutralize the sour taste to and extend, this can be a good meze for raki as well.

some sugar can be added to that yoghurt mix (or honey) if your taste is on the sweet side, but this sounds far too experimental , no guarantee about the outcomes.

another good idea can be collecting them and distributing to your neighbours; make sure that you leave the cup and they will return the cup full with something to eat, most probably which is not as sour as those plums. (turkish tradition, but why not use it for some innocent barter whilst increasing your neighbourly reputation) this is going to be fun since you can not guess what is going to come...

I think Can's idea is the best, collect them in a cup and give them to your neighbours and hope you get something sweeter in return ......... for example - a lovely fat, juicy and sweet Turkish fig when they are in season!

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